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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a854efce772d6a30abbb8d1eb89dd203497e7ba3cbc32492d5fb1ac3006e965e' 
  AND token = 'MwOySzz11OBxmxYsONO39evzxWRdKDvTcnnPVcT6cJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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