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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd995cbe09ba74d30a0e0956915dfbd642a26949e05ade0a5466e26390001238' 
  AND token = '4QLV5Knz+kObKrliNfXRge0TGp6A5WxwUmlwd15Ia7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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