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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c505fd8c028a1ce9a5f6c8a59abf9bf2cc5e45f214c33d05ce7a15e846f9d3' 
  AND token = 'oeMvIvOBXdnRFHvH8S4Yvb8NMTxn0M6tqyX+cu6wqZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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