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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9457605ff41c1b2f3c6f7adcd17dfb73d1c5c6b68a57d11ed8eb4e5fed90bb4a' 
  AND token = 'gIP36foYlnZdviitFzzHeX/tvEn+E+O66uk5CMFWUOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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