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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f09b50c469775e95417252bff334bbc5e2736a247c6a2786e00f9c0529153d' 
  AND token = 'kUAD33E4fc2ws8bdAlpA8GHJw/AQYJka8j4Bnwh3m+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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