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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f1da9d54c7466d95adf09e084fa57ec4fa07bf01596df51a55004f08922761' 
  AND token = 'VjXdV0yniZ1M0qTbwbn11xsa1l8+mpSZQRStnM61Pe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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