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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baafae76640e88ad84342291302127b65b9541e8313c3eeb84e6ed6998a99af1' 
  AND token = 'G4ym3vd9CobrgJnFrI9DFS71WaNwG5OpMnSJvCVi0YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}