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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32659f8885370d63036a55c3fb9ed09ee888559d45f65a65095206151fc161cc' 
  AND token = 'FrsMdBl+WFD5H4M8VhIbAeGEoAUGKp5loCiqBgMwF/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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