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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ed98f6452c172d8af319fe156712eb41662374543918785eaa6d8a52b3bc79' 
  AND token = 'p7aOfNIBTgwMnc4nW+HSjZhd0extvW2avc8l7GXbOJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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