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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada37feaec0da1e7f67a4486149cc5bd47356a79e283906467e91bf0ece22478' 
  AND token = 'Yycqcl1zvMDzt7RK49NHEN1nzTsPqoMxyeABj6iKz0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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