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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dec216e33d609d72dd38a26f6f2b2bf6cb3f5a18071b1c14687e096f7e16f32' 
  AND token = 'L7/Lf0us5fzWD83dXz06DI8g55uJ9DPNMiwAaiOv8MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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