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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7fce5eb335a2ac5f32be3f0c33e23cee5a806b244f7ff545483bc48c812ccd' 
  AND token = '+XPsYY7ZK0I8PVSC/23f3Y5GeMwV+5aBnNmVPnnjYSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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