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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670a3fc77ebc56c10a03d49ca6bca9aa916375376380a348bd9aa3ffcafbcf4c' 
  AND token = 'DImSzC1FcQoUplHnrTly26lsrse00JmtwwgaBHeIbKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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