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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6986a9dd44d57e7460ff718c26bfe16429f3867de2c6b9ceb8735a60bffbaae6' 
  AND token = 'L9k5qcoweWk2hq+/2X+d8clwSq2d6u1SNb8vTRq4mzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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