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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548a10892ac81958a1ef59e307c16e1ef6b24003defcc18a1fd89cc3bae0c486' 
  AND token = '8iEq5hu82KwiDyw45XXtMcp/cXC8IIh73MG/9tp9324=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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