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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f98db7f40feba2075fcfb183dca781d5b552abdfa4f251e1a5c871441b6155' 
  AND token = 'FEpdUyByDJ8I4ITo9toLqwM7LIbOqI4SIm4zNHCShCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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