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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a84e825e7c16d4270ca3d23c720749bd2efed359cf47b5e0e9faefb83ef5687' 
  AND token = 'TPXhx4FZPn5HBoLQPM9zYTESP7uOgKCtHlnKaKGUdtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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