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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c25c86ec536cbe1b86601d1d9636ba0bd7d8b542d596132048fbe9f2370e493' 
  AND token = 'PUkJWG+1l2/O6SgbOKHLfRQpDouOSkmInhEiyowulMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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