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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326fba345879c26e87310947eea4c8c3b3b07134384543122ac9f3d091740a8' 
  AND token = 'VeYHRhMAAOLIBj03UqBGrmHO3adU5m+dQbhQgOue8SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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