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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb11fcc9933a4167bc3319f36f85b6dfc63df9293406d6dae587482c8ac5e4a' 
  AND token = 'n37NcZEbUWFx7JpGx8QV5zHaK30uD0p9aj9MFpdRM90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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