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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58215cf52b60ed1e8f4825ba84646ea182fa941ccf6f4f0c2741627137423d52' 
  AND token = '/qfa96lP3HWdY1KqRH+Gd71ON5Oc115FZO+sXnBrD4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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