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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821badc062fdd3109d28534a8f159a1930a460f742fed5634811d3ab72f45ec5' 
  AND token = 'Or9u1aAlWk7RqRYNyAvbyegEAGEK0vrYv9jhqaBB77Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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