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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9631420b9c60331d7c7c6b412a64ede4a254f88762457c38f402e775d10f958e' 
  AND token = '8J9njzY0DjcDHINdMUIC5mL3w0N1PG6dHdL+n5Dv2O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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