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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1477ba68dd7437d3a5db6ebc7aba58613eaea05f98639e5260c384e9724e2401' 
  AND token = '2vBXn0zNeA/hxBNwJWgt8Ris5sdU3u8S7/KYcNhZ5jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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