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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b503f70ef6cc72cb18307b9516d62974d8888d11fc4c664d1995bf0ad78033' 
  AND token = 'kTgjNtqoOkJ9XizWWbWHk2mzdOHI4+NBsTHKTnoeBxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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