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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f1abeea6dc482f5af77d8c52f010e3ef60ebf20c7d663dbaddd8160db980dd' 
  AND token = 'EiA/8sWiarXiDknSdwGOIzdGDhT6p5WI0KO5HHxlvB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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