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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9caf3c6e10501d5b5d5d43613cb5ce45d8e77ff3a6e29cecaa48faa279f5db' 
  AND token = 'EZI8Y1tI5NoEX7TcjOyI4meK5mNRWRxolKxqzUjZZrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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