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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccaaf70c68815763e2314ac5ee7467b0fdf887ff20efc60d9f33badcefa13ca' 
  AND token = 'qhz6uiw4bagBNJ5uiOY95k+GELaJStqEcLp/bMLRz1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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