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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ee0d8b6b26ce194a9dc978170ae82de4a2c33b42d77ab4f12461bc5c59e5f0' 
  AND token = 'ePSCeipzoUXQTLGbwM6RKvK/idAsUteWMfrOkECw4W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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