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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e56b288053aa09c691d6ae83a690ac73d2d0419b24822c73b3edff600256ecd' 
  AND token = 'ZFIolt0mlPsN+z73Kp+OqQG7up+z1l0ANOijnB6QUE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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