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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cf659781b925242814decdcf259d08ebe913bdbbfe4caf438753b9b0e3bb17' 
  AND token = 'K/b6xe0OPcda8m9EKNRR/1DlJNo4OZc3zsWVpCWFCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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