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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745f08bac24cc887e73d50eef83468925804ef31a4b588449e29539e25dbbf0f' 
  AND token = 'FCcYi0DB4X6NEn59CpB4vce3gZxUPnsp2CZ8bF8ZCrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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