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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb04e0bdc0bc3ee541a0c2c9dca55802c923c6e4faf6e50ad4a064774a1e410' 
  AND token = 'zxHaBYIS62EG1YClH6fuUHnAUVlThmGLs3TS3W3CdPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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