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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba20d5a01478b1df389b74ff03393a46425b13795e338d50d3e8d3cc22fa683' 
  AND token = 'Q7SDu3aZj5UZfHMM+1HRa5zCamYB8F0O4c8uN0ZgiQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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