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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c245c5ab073dd5443a3479c3cdf7f79c5c4a0cbce7545b53cfe5e751f72185b' 
  AND token = '8NEVJ1kz6QH7+carVI4rTEb+HixOrce4cpwvnoB8Aes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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