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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca8f6f9e2bb40e4c49923c808fd98ff3b8dc1731a5cf3b423f46801a57d830' 
  AND token = 'ObRkVVQtytdX2fFpsV5ijbg5jUoeeBvliDeUk1j+gJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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