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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf67e3f11e8c184d3bb0cf994b65d26089c373c973dc5057b66f94e8b0fb0e7d' 
  AND token = 'BJsO6JPTFywVXMLQEgo0kNFYcctATopQsUW8fpSBKAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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