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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fb2ceee0a0bdc827f041f277c4fbdb2fb791c43b59134a6457fc9d16b0dc1d' 
  AND token = '4IFpJI8iSObnWlOSSQBtEBFtKLTwuIro+GzscLOITWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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