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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809808f0615801eca0c1ea1872e27d2ef833e1864d7ae2446abecce779c3d165' 
  AND token = 'eXUd1EMe9GYNM/Dlbv2LaniRVarMylrm+ZtnrlC3tRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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