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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9752c0d18c18a0e9e939b5c810dd4d4ca60d349488144afd071a59a03b0b08ac' 
  AND token = 'wluowo2YcLadrwwAuO/xNsj7AETyx3pvniktolrLUtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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