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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6713a9266c15e46dd905ae36095c52fad6a1064b12d0e30ab236704d4dbc4b' 
  AND token = 'tCVRY0yf6vwOB2DjeL/LLy9XmQpbRgbB3pCexmS/HFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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