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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f3615eeabfb9cd6a67184dd81e1e52864ca2c497c0d07a644592ad6c5cb207' 
  AND token = 'HvralZe2Q4diBR6qolWTBuL839o5Ajv1pSTkjI57Fbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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