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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc237ca851f2374f04525731098c21ff08c3663a3ee1bce62b02a2c7d369165' 
  AND token = 'H51rGjpiCMtN4r97AubSPX/wfVHPpKHq1QRQ7S/dim0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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