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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b591f1fd183eeb8669dec24871774d79accb645e4587a631044b090e96d781cc' 
  AND token = 'hkd7o9jFVAQwhZiQc7kGh57NqNunZwz2vdHnClIltF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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