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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bd4bb9209807e32bdf4e30cd5e7a605026eb98194bddf48ca319379d64b1db' 
  AND token = 'tLVKkG1uDvAWKN/pAY3NoKagVkp/gtk/XpUiV2/PPcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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