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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b929f7a5bb993e73c2a1ea4e5a70c33415a40204b79eae9518df4481f245d7' 
  AND token = 'M59FFN9f5EaPHnIR5O2UZtNK1liJg2TmkO+iek81+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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