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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590082a986c2997d33ee41684f65bb7c821deceed40767de96eb68bab9f0756e' 
  AND token = '4JAIvN64csHia696Lx5MZB53ecFNZPo73bz0Tizg+Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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