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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9685d79f90895873d975bed43b8ce61913236ceb5e3d85b69ab9317895af2ffe' 
  AND token = 'HVZ8yUFInC8XkC9XBhh7X3UM/JK02Yzdx5A/uSXf9aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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