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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e51887d50d89a5ece5b9262b97a79672d56adaebf3e7fc67f6630fd85bac42' 
  AND token = 'qOhRJJn82yR9YTxtltY3PtQ01otORHP/9Qy2AQ2ZXK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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