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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4921080fa9fad93cb1daadf8e2bc83b41228bf342845291e183317743d63605f' 
  AND token = '9kV4ta4jt8QTl9LegEgGtTG9zWOt2bYPO5ypk9WO3YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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