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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f075e356e97dee417e8085da0ec80ddead788ebc4e0efa87209a610af7a77fc' 
  AND token = '97G6yIQGp/i8Ewb7yff8f4cJS9ZqWgWs4jXz+2x2qcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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