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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2a58fa91337a86e4a3f12650deae0d099b4e65c7e55d4ec14ffee8ec4063a2' 
  AND token = 'rA62+fyKhFIFugoLWlt1oH7mj4Xzy4Z3fhzoLaQb3y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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