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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db973f7c127d1552e3abc48ec34672d13c9863508f62c848527b46769631989d' 
  AND token = 'qfWTiI1/ti31Z0uI3AMH7fLQUuRK7s7OWyIWV5HKctA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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