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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e356fe8a7c75631535626b2f145dc35e28e1a9d76813ea7d6e3cfd45896d145e' 
  AND token = 'ouTB4XxHj6/gj3b2T71sezxwyQV88nb+VVnXIgg3XyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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