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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc708185159c1505ddc85ecc26e1698eaa50cac823bf8e922d8a4c65571dbad' 
  AND token = 'WCCUZ+2K9/LBe0Z0VE05rFdfo+Um1QVXNJKSyJnTuoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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