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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9382696d2e69a9a67731627ff5111cbe1e4b019da391504064b9eede3330ace0' 
  AND token = 'gIFMyIXhXsLceWgUx3+gqcT+aziuqmj1o/p6ZLAtyGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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