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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bde244cb391ad0e010c3ef0d82b3396b276ab5c8fa1adb86a16ac791dc8e8c' 
  AND token = '//dCLCE/eQJn2b7SpZbntAjlknOO00p1L8ONW8sehdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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