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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83e3937d6c961d013389ec2d4a94d4725125789fd688deabdffb9e3b2e40ee2' 
  AND token = 'snwYDrcwI/OZbfBs0SyEvfOT2MXg4MJ5QXmENfd9pFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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