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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cae0a5964380809b05c325000c05664d2aeea43aee14967f9573c9689c38ec' 
  AND token = '2zXgW8s8VbfClk3S+R0ca3nRgZwau/aLyP5PATTSZCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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