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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c693136d5c7f119d058113a23a165b0062243731e0008c4b8e1182d22e76a2' 
  AND token = '1oUjpbAFHpzv4xJd4i6VBbLf+ojQGcX2MzXjNWx9b3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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