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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f613f92778a4e2be6ddcadb6ac95a1b1f87a5558d9a70c0689c580323c0e5c' 
  AND token = 'udw0I4zwPNjRrshe7TroLmNBhih4VyStdrQYHk5qktI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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