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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36e5048bc7a8e076504ddd3e4c06f11159ce344cfed02b1d32ac03db6e3f8eb' 
  AND token = 'owxZ+GFnS+YHLYA9rwv+5gebXRHuf2sd5hvYF7udHmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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