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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c228043be189f142ca6b60249e2c70f8f16753699cb58b6bd5be3dc8f193477a' 
  AND token = 'du7+9NOqyUpicp86k+tm2AeO+q6TydXnK9IQLUCMV1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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