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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738abbd32df50b5a439b6b26002bcd5bbb6c9c318111f339f8c880957ec9b680' 
  AND token = 'LFaGtkqfQeEQi813hSgu3qHuIojt3aanVC+aK/Rt56c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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